GUYNEMER, THE ACE OF ACES. By Jacques Mortane. Translated by Clifton H. Levy. (Moffat, Yard & Co., New York. Price, $1.50. 267 pp., 28 ill.) This volume, which appears under the pen of one of the best French aeronautical writers—who was by the way a close friend of the late Ace—will serve as a valuable contribution to the military record of the Allies’ great aerial leaders.